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Safety Earth Connection
Any mains powered item of SSL equipment that is supplied with a 3-core mains lead (whether connectorised or
not) should always have the earth wire connected to the mains supply ground. This is the safety earth and
grounds the exposed metal parts of the racks and cases and should not be removed for any reason.
Mains Supply and Phases
SSL equipment is designed for connection to single-phase supplies with the Neutral conductor at earth potential
–
category TN – and is fitted with a protective fuse in the Live conductor only. It is not designed for use with
Phase (Live) and Neutral connections reversed or where the Neutral conductor is not at earth potential (TT or IT
supplies).
All mains powered assemblies must be connected to the same mains phase. In particular, note that as PSU
redundancy is standard, the two input leads must NOT be connected across different phases.
Mains cables will be coded with either of the following colour schemes:
1 or 2
LIVE: Brown Black
NEUTRAL: Blue White
EARTH: Yellow/Green Green
Mains Isolation and Over-Current Protection
An external disconnect device (switch) is required for this equipment which must be installed according to
current wiring regulations. A detachable power cord, if fitted to this equipment, is a suitable disconnect device;
otherwise an approved disconnect switch is required – the rating of which is defined in the product specification
(Appendix A) and on the equipment itself.
An external over-current protection device is required to protect the wiring to this equipment which must be
installed according to the current wiring regulations. The fusing or breaking-current is defined in the product
specification. In certain countries this function is supplied by use of a fused plug.
Some equipment (specifically units with PSU Redundancy) utilises multiple power sources. This is clearly
marked on the equipment. The finished installation must also be clearly marked to ensure that all sources of
power are removed before servicing begins.
Physical Safety
Most subsystems are too heavy for one person to lift. Take particular care when removing the computer chassis
from the equipment rack.
If the console trim is removed for any reason then there may be sharp edges exposed on the frame metalwork.
Page 4
C100 Installation Guide